General Information:
Chemical Formula:
Al2Si2O5(OH)4
Composition:
(Molecular Weight = 258.16 gm)
Aluminum 20.90 % Al
Silicon 21.76 % Si
Hydrogen 1.56 % H
Oxygen 55.78 % O
Empirical Formula:
Al2Si2O5(OH)4
Name Origin:
Named after the Scottish chemist, A. B. Dick.
Physical Properties:
Cleavage:
[001] Perfect
Color:
blue, colorless, gray, yellow brown, or white.
Density:
2.6
Diaphaniety:
Subtranslucent to opaque
Habits:
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite)., ,
Hardness:
1.5-2 - Talc-Gypsum
Luster:
Pearly
Streak:
white
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